I have the following code which is executed when the mouse clicks on a button and provides a new value of centerFreq:
Qt Code: 
  1. double interval = 48000;
  2. d_interval.setMinValue(::centerFreq - 25000);
  3. double minimum = d_interval.minValue();
  4. d_interval.setMaxValue( minimum + interval );
  5. double maximum = d_interval.maxValue();
  6. QwtPlot::setAxisScale( QwtPlot::xTop, minimum, maximum, 10000 );
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It functions ok but I would like to change two things.
First, say the centerFreq has a value of 7192000, then the scale labels display as 7.19e+06, 7.2e+06, etc.
I would like to know how to make the labels display like 7.190, 7.200, etc.
Secondly, the grid has 5 major ticks with 4 minor ticks in between.
I would like 9 minor ticks in between each major tick.
I tried setting up a QwtScaleDiv and it worked but it overwrote the labels calculated from centerFreq.

Any tips as how I can accomplish these two changes?
Thanks for any help.